Diaphragm valve



FIG. 1 is a perspective view of a diaphragm valve showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is top plane view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is another perspective view;

FIG. 9 is still another perspective view; and,

FIG. 10 is yet another perspective view.

The broken lines in the drawings illustrate portions of the diaphragm valve and form no part of the claimed design. 

CLAIM The ornamental design for a diaphragm valve, as shown and described. 